Obviously, lots of people responding who don't own a 6.0, Ford, or ever did. Anyway, I currently drive a '10 F450 6.4 and did have a '06 F350 6.0 for 8 years. The 6.0 turbo vanes did rust once from sitting too much during one winter. Otherwise, no issues.
Don't go by what the youtube guy says or what the rv.net experts say. Instead, research Fords at Ford-Trucks.com or powerstroke.org. Even then, keep in mind that various engines go in and out of vogue. You need to look at posts from a few years ago as well.
All of the 6.0 issues are well documented. The '03 was the first year and had the most issues. However, it is possible to get a good one. '05 also saw a suspension change as well as other changes that make it better. If I was looking for a 6.0, I'd like for '05 or above.
6.0s hate sitting and like being run with fuel additives. The 6.0s are very easy to steal and don't have a chipped key. That's probably one of the biggest issues. Apparently, the thieves didn't get the memo that the truck was awful and not worth driving. :)